| Heiloo to Octeville | 343.73 mi (553.19 km) |
| Heiloo to Oignies | 164.79 mi (265.20 km) |
| Heiloo to Oissel | 274.80 mi (442.24 km) |
| Heiloo to Olivet | 350.03 mi (563.33 km) |
| Heiloo to Ollioules | 655.74 mi (1,055.31 km) |
| Heiloo to Olonne-sur-Mer | 509.55 mi (820.05 km) |
| Heiloo to Oloron-Sainte-Marie | 694.62 mi (1,117.88 km) |
| Heiloo to Onet Village | 577.12 mi (928.79 km) |
| Heiloo to Onnaing | 160.24 mi (257.88 km) |
| Heiloo to Orange | 584.66 mi (940.92 km) |
| Heiloo to Orchies | 159.89 mi (257.32 km) |
| Heiloo to Orleans | 347.39 mi (559.08 km) |
| Heiloo to Orly | 285.16 mi (458.93 km) |
| Heiloo to Ormesson-sur-Marne | 280.22 mi (450.97 km) |
| Heiloo to Orsay | 291.43 mi (469.01 km) |
